Im not going to try and convince people who have already made their mind up, but I ditched Fusion for Blender ages ago and haven’t looked back. Its completely usable for CAD and precision design for 3D printing or what have you. Its not built for it, but its capable if you learn how.

The lack of pure CAD focus is a drawback, but it is largely made up for in blenders absolutely amazing general purpose tool set. Its not just mesh manipulation, with geometry nodes you can create complex intricate shapes that are also precise to your requirements. There are countless workflows and plugins that allow you to make blender adapt your needs. You can remix existing STLs and bring in reference photos/models/etc. Simply put IMO there is no need to use any other program for almost any aspect of 3D design, and so it has become my go to.

I don’t recommend it for beginners, but it really is an incredibly powerful tool if you put the work in. Is it better that FreeCAD or Fusion? I am not qualified to say, but I’m pretty confident there are few features either package has that blender does not.